Two northern Colorado wildfires that began Friday night were 100 percent contained by Saturday morning.

The first, the Arthur's Rock Fire in Lory State park, had burned about 2 acres, and was completely contained by 9:15 p.m. Friday night, according to a news release from the Poudre Fire Authority. The fire did not grow overnight.

Larimer County resources were on scene overnight to mop up and monitor conditions, and Poudre Fire Authority resources took over Saturday morning. The Arthur's Rock Fire is burning about 10 miles northwest of Windsor.

Smoke may still be seen in the area, so spectators are asked to not call 911 to report the smoke, the release stated.

Tony Simons, incident command and Larimer County Emergency Services specialist, said he couldn't say when the fire would be completely extinguished. The cause of the fire is still under investigation.

The other fire was at the Bobcat Ridge Natural Area, about 20 miles west of Windsor, and it had been 100 percent contained late Friday night, according to the Loveland Fire Rescue Authority's Facebook page.

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Two helicopters assisted ground crews during the containment operation, and mop up of the fire was continued Saturday morning. Loveland Fire Rescue personnel were working with firefighters from the Berthoud Fire Protection District and the Front Range Fire Rescue Authority.